CHM136H1 Lecture Notes - Lecture 31: Phenyl Group, Benzene, Atomic Orbital
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CHM136H1 Full Course Notes
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Benzene and aromaticity: molecular orbital theory, huckel rule. Expected to know the common names of aromatic compounds. Based on size of alkyl sub, they are termed alkyl-sub"d or phenyl-sub"d. Term phenyl (ph) is used in cases of sub benzene ring in the -c6h5. Follows the same basic rules as regular naming with locants, etc. Common names can serve as root names, such as tolune in tnt Reactivity of this is much lower than alkenes. The benzene is more stable leading to such substitution. This, in fact, is lower in energy than other cyclohexenes. All c-c bonds are same length and e-density is same in all c-c bonds. Carbon atoms and orbitals are equivalent - 4 dou. All pi electrons move freely in entire ring due to equal overlap of all p orbitals. Drawing a circle within rather than the double bonds shows the resonance. These have to be approximated by various computational simplificiations.
